From: Stephen Tweedie <sct@redhat.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: "Stephen C. Tweedie" <sct@redhat.com>,
Andrew Morton <akpm@zip.com.au>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: Automatically mount or remount EXT3 partitions with EXT2 when alaptop is powered by a battery?
Date: Thu, 4 Jul 2002 21:30:53 +0100 [thread overview]
Message-ID: <20020704213053.A28200@redhat.com> (raw)
In-Reply-To: <20020703030447.GC474@elf.ucw.cz>; from pavel@ucw.cz on Wed, Jul 03, 2002 at 05:04:48AM +0200
Hi,
On Wed, Jul 03, 2002 at 05:04:48AM +0200, Pavel Machek <pavel@ucw.cz> wrote:
> > an fsync() on any file or directory on the filesystem will ensure that
> > all old transactions have completed, and a sync() will ensure that any
> > old transactions are at least on their way to disk.
>
> Ugh, does that mean that if I
>
> "sync ; poweroff"
>
> my data are not safe?
Right --- sync only guarantees that the writes have started; you're
not safe until the disk light is off.
The VFS kernel core syncs each filesystem sequentially during sync and
bdflush. If we do each one synchronously, we end up serialising IO
and performance with multiple disks goes _way_ down. However, you can
choose synchronous completion of ext3_write_super() by giving modular
ext3 the module option "do_sync_supers=1".
--Stephen
next prev parent reply other threads:[~2002-07-04 21:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-24 20:02 Automatically mount or remount EXT3 partitions with EXT2 when a laptop is powered by a battery? Miles Lane
2002-06-24 20:23 ` Andreas Dilger
2002-06-24 20:27 ` Richard B. Johnson
2002-06-25 17:03 ` Automatically mount or remount EXT3 partitions with EXT2 when alaptop " Andrew Morton
2002-06-25 17:24 ` Miles Lane
2002-06-25 19:35 ` Andrew Morton
2002-07-03 3:02 ` Pavel Machek
2002-06-26 0:13 ` Stephen Tweedie
2002-06-26 18:39 ` Andrew Morton
2002-07-02 13:23 ` Stephen C. Tweedie
2002-07-03 3:04 ` Pavel Machek
2002-06-28 21:59 ` Daniel Kobras
2002-07-02 12:13 ` Stephen C. Tweedie
2002-07-03 3:04 ` Pavel Machek
2002-07-04 20:30 ` Stephen Tweedie [this message]
2002-07-04 22:05 ` Daniel Kobras
2002-07-05 7:59 ` Stephen Tweedie
2002-07-06 0:58 ` Pavel Machek
2002-07-23 11:14 ` Stephen C. Tweedie
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